Method of casting, self-stripping and rapid-cooling steel ingots



413 1939- s. H. GRIFFITHS 2,169,797w

METHOD OF CASTING SELF STRIPPING AND RAPID-COOLING STEEL INGOTS' 7 FiledDec. 31, 1937 2 Sheets-Sheet 1 15, 1939. I s. H. GRIFFITHS 2,169,797

METHOD OF CASTING SELF STRIPPING AND RAPID-COOLING STEEL INGOTSFiled-Dec. 51, 1937 2 ShetseSheet 2 m pia I 1 Q L? m a .6 g

Patented Aug. I5, 1939 UNITED. STATES mnrnonor'css'rmd, sm-srnlrrmoimnRAPID-COOLING STEELINGO'IS ,Septimus moi-mun, Canton, om ApplicationDeoember :21, 1937, Serial No. 132.900

20mm. maze-212) This invention pertains to a new and meritorious methodof self-stripping an ingot from its mold, and at the same time toeliminate the formation of certain -'defects frequently known to existin the cast ingot product, such as piping," blow holes and internaldendritic ruptures well ,known tothoseskilledjn the artas internal pointcracks.

The prime objects of the invention are to provide a new, simple andimproved method of self-stripping the ingot from its mold, said meth- 0dat the same timeserving to eliminate certain defects that are known toexist within the ingot by seating the ingot on its support in spacedrelation thereto, maintaining the .ingot within the major mold sectionin spaced relation to the inner wall thereof, permitting cool air tocontact and freely circulate within and through the space formed betweenthe peripheralwall of the ingot and the inner wall of said majorsection, thussubjecting the saidv walls to a more rapid and uniformcooling thereof, and serving to more thoroughly and completely solidifythe ingot. and to materially increase the quality,fquantityand value ofthe ingot product, within a given period such as are made by the use ofa big-end-up type of mold. and from any known type of steel, or

grades of metal heretofore utilized in connection withthis art for theproduction of ingots.

The. disclosure herewith is illustrative of one of the preferred meansemployed in carrying out themethod set forth constituting thisinvention, and, therefore, is not considered in. the limiting sense,since it is "evident that'this' method may be carried out withstructures other than those specifically disclosed herewith. i o I Theforegoing'and such other-objects as may appear fromthe ensuingdescription areaccomplished by the combination, arrangement, locationand construction of the several parts-hereinafter more, fully described,illustrated in the accompanying drawings, and more particularly Qpointed out and-hereinafterdescribed.

In the accompanying drawings forminga part. .of. thisspeciflcatiomshowing one of the preferred types of mold employed incarryingout in vention, it will be seen:

- Figure 1 is a sideelevationof the type of sectional mold employed inconnection with my invention, showing means broken away. and attached'totheupper section for lifting it, away from the lower section.

Fi e 2 is a side elevation of the mold, sh'owins me ns d to t e MVP smen-a d to the mold support for fixedly securing the lower section tosaid support: j

. Figure 3 is a sectional elevation of the mold shownin Fig. 1 with thelifting means removed.

Figure 4'is an enlarged sectional view taken in 5 the plane shown bydotted lines 4-1, Fig.2.

' --Figure 5 is a side'elevation-of the large upper section of the mold,showing said section and the liftingmeans partly in section and partlyinfull lines with the-lower end portion of the ingot 10 seated upon .itssupport. Figure 6 is a sectional elevation of the large upper moldportionin cross sectiomthelifting means, ingot, and the ingot support infull lines,

and showing the meeting face of the said mold l portiondisposed inspaced relation with the said support, andthe ingot in spaced relationwith the inner wall of the mold portion with arrows indicating how thecool, fresh air flows beneath" the meeting face-of the mold sectionintocontact go with the outer wall of the ingotand the inner j wall ofthe major mold section.

Figure! is an inverted plan of the upper section of the mold, .and

Figure 8 is a plan of the lower section of the g mold.

In the embodiment of the mold employed in connection with this inventionit will be seen that the numeral 2 designates the major upper section ofthe mold formed with a laterally extended lug 3o 3 ateach side of itsupper end portion for the reception of suitable detachable lifting'meansI for lifting and moving the section away from contact with the lowerminor section '5 of the mold, lower end of said major section at'two 5'opposite sides thereof being provided with a con:

tinuous dependingextension 6 in alinement with its outer wall and formedat its lowermost end -in 'alinement with its outer wall, and re'verselybeveled, as shown in Fig. so that when it is 50 desired to join thesections together it is simply necessary to lower the upper Section.until. ts

, lower extendedbeveled portions contact with the upper and outerendportions of the minor section, whenby further lowering said uppersec- PATENT omcs sisting in removing the major mold section with itscontained ingotprojecting below the lowermost and of said section awayfrom the minor mold section, seating the lowermost end of the ingot on asupport, releasing the lifting tension from the major mold section,permitting said major section to automatically gravitate until itslowermost end portion is also seated on the support with its meetingface in spaced relationto said support, said gravitation simultaneouslyforcing the ingot to be stripped away from the inner wall of the majormold section with its topprojecting beyond the top of said section andmaintaining the ingot within the mold section in spaced relation to theinner wall of said section,

permitting, the free flow of cool air beneath said meeting face tocontact with the wall of the ingot and the inner wall of the majorsection to rapidly cool and solidify the ingot, removing the ingottensions at its meeting end serving to form an from the upper end of themajor section, then conveying the ingot to its proper destination.

j 2. The method of casting, self-stripping and rapidly cooling a steelingot within a mold dividedhorizontally into a major upper section and aminor lower section, each section having exis seated'on said supportwith its meeting face in spaced relation with the support, saidgravitation simultaneously forcing the ingot to be stripped away fromthe inner wall of the major section and project the upper endof theingot beyond the upper end of said section, supporting the inset withinthe major section in spaced relation 1 with its inner wall, maintainingthe ingot within said mold section to simultaneously permit the freecirculation of air into and through the mold section in contact with theinner wall of the major section and the entire wall of the ingot untilthe entire ingot shall have been rapidly and completely cooled andsolidified, then lifting the ingot from the top of the mold section andconveying it to its proper destination.

- SEPTIMUS H. GRIFFITHS.

